The lips are comprised of three principle layers (skin, muscle, and mucosa) and have no direct skeletal part. The lip complex is a very distinct anatomic and aesthetic facial unit (Fig. 2A). The inferior border of the lower lip is well marked by the gentle curving mental crease, whereas the superior border of the lip is marked even more clearly by the nasal base and bilateral melolabial (nasolabial) creases. Relaxed skin tension lines of the lips are oriented in a radiant fashion about the mouth opening, similar to the spokes of a wheel, and are reflected in older patients as labial rhytids (Fig. 2B). A principle feature of the lips is the vermilion, which is
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